package thread;

public class SyncDemo1 {
    public static void main(String[] args) {
        /*
        Shop shop = new Shop();
        Thread t1 = new Thread("王克晶"){
            public void run(){
                shop.buy();
            }
        };
        Thread t2 = new Thread("范传奇"){
            public void run(){
                shop.buy();
            }
        };
        t1.start();
        t2.start();
         */
        Shop shop1 = new Shop();
        Shop shop2 = new Shop();
        /*
        Thread t1 = new Thread("王克晶"){
            public void run(){
                shop1.buy();
            }
        };
        Thread t2 = new Thread("范传奇"){
            public void run(){
                shop2.buy();
            }
        };
         */

        Thread t1 = new Thread(shop1::buy);
        Thread t2 = new Thread(shop2::buy);
        t1.start();
        t2.start();
    }
}

class Shop{
    //public synchronized void buy(){}//在方法上同步监视(加锁),范围比较大
    public void buy(){
        try {
            Thread t = Thread.currentThread();
            System.out.println(t.getName()+":正在挑衣服");
            Thread.sleep(3000);
            /*
                同步监视块,缩小了监视范围
                同步监视对象通常使用:临界资源
                临界资源:抢谁谁就是临界资源,说白了,抢谁就锁谁
             */
            //synchronized (new Object()){//永远不能用实例化的对象作为同步监视器对象,一定无效
            //synchronized (123){//同步监视器对象一定是引用类型
            //synchronized ("abc"){//虽然可以,但abc并不是合适的锁对象
            synchronized (this){//this为锁对象,锁的当前shop对象.只要是同一个对象,就一定会被锁住
                System.out.println(t.getName()+":正在试衣服");
                Thread.sleep(3000);
            }
            System.out.println(t.getName()+":结账离开");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}